इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS/IEC 60060-3 (2006): High Voltage Test Techniques, Part 3: Definitions and Requirements for On-site Testing [ETD 19: High Voltage Engineering] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS/IEC 60060-3 : 2006 Hkkjrh; ekud mPp&okYs Vrk ijh{k.k rduhoQas Hkkx 3 vkWu&lkbV ijh{k.k dh ifjHkk"kk,¡ vkSj vis{kk,¡ Indian Standard HIGH-VOLTAGE TEST TECHNIQUES PART 3 DEFINITIONS AND REQUIREMENTS FOR ON-SITE TESTING ICS 17.220.20; 19.080 © BIS 2011 B U R E A U O F I N D I A N S T A N D A R D S MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 N ovembe r 2 011 Price Group 10 High Voltage Engineering Sectional Committee, ETD 19 NATIONAL FOREWORD This Indian Standard (Part 3) which is identical with IEC 60060-3 : 2006 ‘High-voltage test techniques — Part 3: Definitions and requirements for on-site testing’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the High Voltage Engineering Sectional Committee and approval of the Electrotechnical Division Council. The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’. b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their respective places are listed below along with their degree of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence IEC 60060-1 : 1989 High-voltage test IS 2071 (Part 1) : 1993 High-voltage Identical techniques — Part 1: General test techniques: Part 1 General definitions and test requirements definitions and test requirements (second revision) IEC 60060-2 : 1994 High-voltage test IS 2071 (Part 2) : 1974 Methods of Technically Equivalent techniques — Part 2: Measuring high- voltage testing: Part 2 Test systems procedures (first revision) IEC 60071-1 : 1993 Insulation co- IS 2165 (Part 1) : 1977 Insulation do ordination — Part 1: Definitions, coordination: Part 1 Phase to earth principles and rules insulation coordination principles and rules (second revision) For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS/IEC 60060-3 : 2006 Indian Standard HIGH-VOLTAGE TEST TECHNIQUES PART 3 DEFINITIONS AND REQUIREMENTS FOR ON-SITE TESTING 1 Scope This part of IEC 60060 is applicable to the following on-site test voltages and in service stresses, which are in relation to IEC 60060-1: – direct voltage; – alternating voltage; – lightning impulse voltage of aperiodic or oscillating shape; – switching impulse voltage of aperiodic or oscillating shape. For special tests the following voltages are used: – very low frequency voltage; – damped alternating voltage. This standard is applicable to equipment with a highest voltage U greater than 1 kV. The m selection of on-site test voltages, test procedures and test voltage levels for apparatus, equipment or installations is under the responsibility of the relevant technical committee. For special applications, on-site test voltages different from those described in this standard may be specified by the relevant technical committee. NOTE 1 The different voltage waveforms listed above do not necessarily provide equal stress on the test object. NOTE 2 The selection of the test voltage levels should take the larger tolerances and measuring uncertainties into account. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test requirements IEC 60060-2:1994, High-voltage test techniques – Part 2: Measuring systems IEC 60071-1:1993, Insulation co-ordination – Part 1: Definitions, principles and rules 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. For all other definitions relating to testing procedures, see IEC 60060-1, and for those relating to measuring systems, see IEC 60060-2. Definitions of parameters are given in the relevant clauses of this standard. 3.1 on-site test test at the place of use of the apparatus, equipment or installation that is to be tested, and with the test object as far as possible in its service condition 1 IS/IEC 60060-3 : 2006 3.2 impulse voltage intentionally applied aperiodic or oscillating transient voltage, which usually rises rapidly to a peak value and then its enveloping curve falls more slowly to zero (IEC 60060-1:1989, Term 3, modified) 3.3 lightning and switching impulse voltages a distinction is made between lightning and switching impulse voltages on the basis of duration of the front. Impulses with front duration up to 20 µs are defined as lightning impulse voltages and those with longer fronts are defined as switching impulse voltages Generally, switching impulse voltages are also characterized by total durations considerably longer than those of lightning impulse voltages. (IEC 60060-1:1989, Term 3.1) 3.4 characteristics of the test voltage those characteristics specified in this standard for designating the different types of voltage excursion that define the test voltage (IEC 60060-1:1989, Term 4.2) 3.5 prospective characteristics of a test voltage the characteristics which would have been obtained if no disruptive discharge had occurred. When a prospective characteristic is used, this shall always be stated (IEC 60060-1:1989, Term 4.2.1) 3.6 actual characteristics of a test voltage characteristics that occur during the test at the terminals of the test object (IEC 60060-1:1989, Term 4.2.2) 3.7 value of the test voltage as defined in the relevant clauses of the present standard (IEC 60060-1:1989, Term 4.2.3) 3.8 classification of insulation in test objects insulation systems of apparatus and high-voltage structures must basically be classified into self-restoring and non-self-restoring insulation and may consist of external and/or internal insulation (IEC 60060-1:1989, Term 5) 3.8.1 external insulation distances in atmospheric air, and the surfaces in contact with atmospheric air of solid insulation of the equipment which are subject to dielectric stresses and to the effects of atmospheric and other external conditions such as pollution, humidity, vermin, etc. (IEC 60071-1:1993, Term 3.2) 2 IS/IEC 60060-3 : 2006 3.8.2 internal insulation internal solid, liquid or gaseous insulation, which are protected from the effects of atmospheric and other external conditions (IEC 60071-1:1993, Term 3.3) 3.8.3 self-restoring insulation insulation that completely recovers its insulating properties after a certain time interval following a disruptive discharge caused by the application of a test voltage (IEC 60071-1:1993, Term 3.4, modified) 3.8.4 non-self-restoring insulation insulation that loses its insulating properties, or does not recover them completely, after a disruptive discharge caused by the application of a test voltage (IEC 60071-1:1993, term 3.5, modified) NOTE In high-voltage apparatus, parts of both self-restoring and non-self-restoring insulation often operate in combination and some parts may be degraded by repeated or continued voltage applications. The behaviour of the insulation in this respect should be taken into account by the relevant technical committee when specifying the test procedures to be applied. 3.9 measuring systems and their components 3.9.1 measuring system complete set of devices suitable for performing a high-voltage measurement (IEC 60060-2:1994, Term 3.1.1, modified) NOTE 1 A measuring system is usually comprised of the following components: a converting device with the leads required for connecting this device to the test object and the connections to earth, a transmission system connecting the output terminals of the device to the indicating or recording instruments with its attenuating, terminating and adapting impedance or networks, and indicating or recording instruments together with any connections to the HV source. These components can be arranged in one compact unit together with the HV source. This usually applies to portable test equipment for medium-voltage apparatus. NOTE 2 Measuring systems which are based on non-conventional principles are acceptable if they meet the accuracy requirements specified in this standard. NOTE 3 The environment in which a measuring system functions, its clearances to live and earthed structures and the presence of electric or magnetic fields may significantly affect its accuracy. 3.9.2 record of performance of a measuring system detailed record, established by the user, describing the system and containing evidence that the requirements given in this standard have been met. This evidence shall include the results of the initial acceptance test and the schedule and results of each subsequent performance test and performance check (IEC 60060-2:1994, Term 3.1.2) 3.9.3 approved measuring system a measuring system that is shown to comply with the requirements of this standard by: – an initial performance test; – successive performance checks and p erformance tests; – inclusion of the results of these tests in the record of performance. 3 IS/IEC 60060-3 : 2006 The system is approved only for the arrangements and operating conditions included in its record of performance (IEC 60060-2:1994, Term 3.1.3, modified) 3.9.4 reference measuring system measuring system having sufficient accuracy and stability for use in the approval (calibration) of other systems by making simultaneous comparative measurements with specific types of waveform and ranges of voltage or current (IEC 60060-2:1994, Term 3.1.4) NOTE A reference measuring system (maintained in accordance with the requirements of IEC 60060-2:1994) can be used as an approved measuring system but the converse is not true. 3.9.5 converting device device for converting the high voltage to be measured into another quantity, compatible with the indicating or recording instrument. Usually voltage dividers or high-voltage measuring impedances are used (IEC 60060-2:1994, Term 3.2, modified) NOTE Other examples of converting devices are voltage transformers, optical sensors and electric-field probes. 3.9.6 transmission system set of devices that transfers the output signal of a converting device to an indicating and/or recording instrument NOTE 1 A transmission system generally consists of a coaxial cable with its terminating impedances, but it may include attenuators or other devices connected between the converting device and the instrument. For example, an optical link includes the transmitter, the optical cable and the receiver as well as related amplifiers. NOTE 2 A transmission system may be partially or completely included in the converting device. (IEC 60060-2:1994, Term 3.3) 3.9.7 indicating or recording instrument device intended to display or provide a record of the value of a measurand or a derived quantity (IEC 60060-2:1994, Term 3.4) 3.9.8 scale factor of a measuring system factor by which the value of the instrument reading is to be multiplied to obtain the value of the input quantity. The assigned scale factor is that determined at the most recent performance test NOTE 1 For many measuring systems the value of the input quantity is displayed directly (i.e., the scale factor of the measuring system is unity). NOTE 2 A measuring system may have more than one scale factor, for example, it may have different scale factors for different frequency ranges or impulse shapes. (IEC 60060-2:1994, Term 3.5, modified) 3.9.9 dynamic behaviour of a measuring system behaviour of the measuring system in case of a transient change of the input quantity described by the step response or the amplitude/frequency response 4 IS/IEC 60060-3 : 2006 3.9.10 uncertainty of a measurement parameter, associated with the result of a measurement that characterizes the dispersion of the values that could reasonably be attributed to the measurand 3.9.11 tolerance permitted difference between the measured value and the specified value – to be distinguished from measuring errors, which are the differences between the measured values and the true values NOTE 1 The measured test voltage is required to lie within the stated tolerance of the specified test level. Test levels are specified by the relevant technical committee. The true value is not exactly known; it is estimated to lie within the range of the measurement uncertainty with the stated coverage probability. The true, but unknown, value may thus lie outside the tolerance range, especially in the case when the measured value is close to the limits of the tolerance range and its uncertainty is partially outside. NOTE 2 The measured value is the displayed value multiplied by the scale factor. The true value is unknown and would be the mean value of an infinitely large number of identical measurements. 3.9.12 rated measuring voltage maximum level of voltage of specified frequency or waveform for which a measuring system can be used, and for which it is within the uncertainty limits given in this standard (IEC 60060-2:1994, term 3.9.1, modified) 3.9.13 operating voltage or current range range of voltage or current of specified frequency or waveform in which a measuring system can be used, and for which it is within the uncertainty limits given in this standard (IEC 60060-2:1994, Term 3.9.2, modified) NOTE The limits of the operating range are chosen by the user and verified by the performance tests specified in IEC 60060-2. 3.9.14 operating time (for direct or alternating voltages) time during which the measuring system can operate at its rated measuring voltage and for which it is within the uncertainty limits given in this standard (IEC 60060-2:1994, Term 3.9.3, modified) 3.9.15 maximum rate of application of impulse voltages with a specified waveform, at which the measuring system can operate within the uncertainty limits given in this standard for a specified time at its rated measuring voltage or rated measuring current (IEC 60060-2:1994, Term 3.9.4, modified) 3.9.16 acceptance test a test on a device or measuring system before it is accepted for use. The acceptance test includes type tests (performed on a device of the same design) and routine tests (performed on every device) to assess its specific characteristics, for example, measurement of temperature coefficient of an element, withstand test, etc. In addition, the acceptance test on a measuring system includes the first performance test (IEC 60060-2:1994, Term 3.10.1) 5